Electric boiler-feed control



Feb. 18, 1930. R YA ARCHlBALD 1,747,498

ELECTRIC BOILER FEED CONTROL Filed April 4. 1928 Inventor Anorn y Patented Feb. 18, 1930 ROSS ALEXANDER ARCHIIBALD, OF SPIRIT RIVER, ALBERTA, CANADA. v

ELECTRIC BOILER-FEED oon'rnor.

Application filed April 4, 1928. Serial N0. 267,381.

The present invention pertains to improvements in electrical controlm'e'ans for regulating the water feed to a boiler andfor maintaining a predetermined quantity of water in the boiler under working conditions.

The invention furthermore includes means actuatedby the low level of the water in the boiler for closing electrical circuits, WlllCll m are adapted to energize certain electro-magreplenishing the boiler.

The same also aids in shutting off this feed when the water level of the water has reached a predetermined point. I

An important object of this mventlon resides in the provision of electrical means for controlling the water feed line to a holler, which includes a primary circuit controlling for closing a circuit at a low water level, for.

energizing a solenoid, which in turn actuates a valve admitting steam pressure into the water feed line for forcing water into the boiler.

A further object exists in the means associated with the float, whereby the steam valve will be maintained open even though the primary phase of the control has been broken by the rising movement of the float within the boiler.

Still another object is to provide contact means for closing the steam line valve when the water has reached a predetermined high level mark.

Other very novel objects and advantages will become apparent after the reading of the following specification and claim.

In the drawings I h The single view discloses a partial longitudinal section through a boiler showing the internal details thereof, and further showing the electrical control circuit 'diagrammatical-- 1y illustrated in proper connection therewith.

nets, which in turn operate valve means for phase, and electro-magnetic devices asso- I ciated and in worklng connection w1th a valve the bar 10 projecting termined level .eng ing the circuitjfi'om the battery 11, l0

Now for a more detail description of the invention, reference is made to the drawing wherein like numerals will designate like parts.

A conventional boiler A is shown in the drawing provided with the usual level gauge glass B. For forcing water into the boiler, a water pump 0 is provided for forcing the water through the feed line D while a steam pump E is employed for eflecting a pressure in the water line to the water pump. A steam pipe F is provided with a shut-off valve G to be controlled by the novel mechanism of this invention.

A hollow body ,1 is movable within the boiler in accordance with the water level, and is provided with an upstanding post 2 constructed of suitable insulatory material which may be glass, porcelain or the like.

plate 3 is secured, while at a predetermined point inwardly on the post a second plate 4 is secured by suitable means.

. As the float 1 continues to rise, the contact plate 4 will lift the pivotal lever 8 from engagement with the head 7 of the bar 6, breaking ,the' circuit to the coil 22, and rendering the entire control de-energized.

Arranged through the side of the boiler are a pair of spaced plugs 55, which'plugs are so constructed of suitable insulatory material. The upperplughas a bar 6 projecting through the same, and formed at its inner end with an upstanding head 7.

Alever 8 is pivotally connected at its inner end to the inner endof the upper plug, and

is formed with an opening 9 adjacent its free end through wnich the post 2 is slidable.

The lower plug 5 is provided with a single bar 9, which is connected at its inner end to the lower metallic plate 4 of the post 2.

The upper metallic plate 3 is electrically connected by a suitable slack conductor to through the top of the holler, and properly insulated therefi'om. 9' Obviously, when the float 1 moves 'downwardlyin accordanoewiththe descending water level, themetallic late 3 will at a predethe lever 8, thus clos- At the upper end of this post, a metallic the bar 6, lever 8, and contact plate 3 through the bar 10 and conductor 12 to the electromagnetic coil 13.

The energization of the coil 13 will attract 5 the armature 14, so'that the contact 15 carried by the armature, and thespring contact 16, will engage for closing a circuit through the battery 17 and resistance-17' to a solenoid coil 18. i

The energized coil 18 will cause the core 19 to move internally of the coil 18, which will shift the link 20 in a manner to open the valve G. At this stage, steam passlng through the pipe F and into the steampump 15 E will force water to the Water pump C.

The latter pump in turn forces water thru the feed line and into the boiler. As the water is fed intothe boiler, obviously the water level will rise and the float rising therewith,

20 causes the disengagement of the contact plate 3 from the lever 8.

While the solenoid 18 is energized, a shunt winding 21 convoluted about the coil 13, serves to increase the energization of the coil 13, so that when the contact 3 becomes disengaged from the lever 8 and-thusly de-energizing the coil 13, the shunt coil 21 will nevertheless remain energized, for maintaining the engagement of the contacts 15 and 16 respectively, and the energization of the solenoid 18.

However, when the float 1 has raised sufficiently to cause the engagement of the contact plate 4 with the lever 8, a circuit will be completed with the electro-magnetic coil 22.

This coil is wound so as to have increased strength over the shunt coil 21, so that upon energization of the same, the armature 14 will be attracted thereto.

The contact 23 onthe armature will thus 40 a separate circuit through the battery 17 for energizing a second solenoid 25 in alinement with the solenoid 18.

The active solenoid 25 will attract the common'core 19, which through the link 20, will result in the closing of the steam valve G.

As the float Lcontinues to rise, the contact plate 4 will lift the pivotal lever 8 from engagement with the head 7 of the bar 6, breaking the circuit to the coil 22, and rendering the entire control de-energized.

Having thus described my invention, what I claim as new is In an electrical controlled water feed for I boilers comprising afloat movable within the t boiler, a pair of vertically spaced contacts on said float, a contact on the boiler for interpositionbetweenithe contacts on the float, an

electrical magnet adapted. to be energized.

when one of the float contacts engages with the contact on the boiler, an armature adapted to be attracted .by said electrical magnet, a circuit including a solenoid operable by the energization of the said magnet, said solenoid being operable to open a valve in the feed line,

contact with the spring contact 24 for closing I and means for maintaining said solenoid energized until the float has reached a certain definite higher position. I

- In testimony whereof I aflix my signature. ROSS ALEXANDER ARCHIBALD. 

